Drawing on expertise learned from building some of the finest loudspeakers in the world, JBL engineers created lightweight, comfortable headphones that deliver signature JBL sound. The J33's premium drivers generate high sensitivity, extended frequency response and pure bass that is deep, powerful and accurate. So you hear the truth from your favorite music. Angled strain relief buckles reduce resonance and three pairs of silicone sleeves are included for optimal comfort and noise reduction. With bold styling like spotlighted metal alloy housing rims, J33 in-ear headphones excel aesthetically as well as acoustically.